A large part of the work for Mairi (our wintering marine assistant) is to collect weekly CTD (conductivity, temperature and depth) data of the seawater. This requires heading out in a boat with some willing volunteers to collect a water sample. A flask is lowered to 500m where it collects a sample before being winched back up. Mairi then takes the sample back to the lab to do some science on it. While we were out on the water today this incredible iceberg crept up on us.